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Security Practices

Core Principle

Simplicity first: Security should be simple to implement, simple to use, and simple to maintain.

Startup agility: Implement essential security from the start, but don't over-engineer. Add advanced security measures when you have real threats or compliance requirements.

Security by Design

1. Security from the Start

  • Consider security in design, not as an afterthought
  • Use secure defaults
  • Follow principle of least privilege
  • Keep security simple and maintainable

2. Threat Modeling

  • Identify threats relevant to your application
  • Focus on realistic threats, not theoretical ones
  • Prioritize based on impact and likelihood
  • Keep threat models simple and actionable
  • Don't model for threats you don't have
  • Add security measures when you have real threats, not hypothetical ones

3. Defense in Depth

  • Use multiple layers of security
  • Don't rely on a single security control
  • Keep layers simple and well-understood
  • Monitor and test each layer

Authentication and Authorization

1. Authentication

  • Use established authentication libraries and services
  • Implement secure password policies (but not overly complex)
  • Support multi-factor authentication (MFA) when appropriate
  • Use session management best practices

2. Authorization

  • Implement role-based access control (RBAC)
  • Enforce authorization at multiple layers
  • Use principle of least privilege
  • Keep permission models simple and clear

3. Session Management

  • Use secure session tokens
  • Implement session timeout
  • Invalidate sessions on logout
  • Protect against session fixation

Data Protection

1. Encryption

  • Encrypt sensitive data at rest
  • Encrypt data in transit (TLS/SSL)
  • Use strong, standard encryption algorithms
  • Manage encryption keys securely

2. Data Handling

  • Don't collect data you don't need
  • Minimize data retention
  • Sanitize data before storage
  • Handle PII (Personally Identifiable Information) with care

3. Secrets Management

  • Never commit secrets to version control
  • Use dedicated secret management systems
  • Rotate secrets regularly
  • Limit access to secrets

Input Validation and Output Encoding

1. Input Validation

  • Validate all user input
  • Validate on both client and server
  • Use allowlists when possible
  • Sanitize input before processing

2. Output Encoding

  • Encode output to prevent injection attacks
  • Use framework-provided encoding functions
  • Context matters - encode appropriately
  • Don't double-encode

3. SQL Injection Prevention

  • Use parameterized queries always
  • Use ORM query builders appropriately
  • Never concatenate user input into SQL
  • Validate input types and ranges

API Security

1. API Authentication

  • Use standard authentication methods (OAuth, API keys)
  • Authenticate all API requests
  • Use rate limiting to prevent abuse
  • Implement API versioning for breaking changes

2. API Authorization

  • Authorize every API request
  • Validate permissions for each operation
  • Don't trust client-side authorization
  • Log authorization failures

3. API Input/Output

  • Validate all API inputs
  • Sanitize API responses
  • Use appropriate HTTP status codes
  • Don't expose internal errors to clients

Dependency Management

1. Dependency Security

  • Keep dependencies up to date
  • Use dependency scanning tools
  • Remove unused dependencies
  • Prefer well-maintained, security-conscious libraries

2. Vulnerability Management

  • Monitor for known vulnerabilities
  • Patch vulnerabilities promptly
  • Test patches before deploying
  • Have a process for emergency patches

Security Monitoring

1. Logging and Monitoring

  • Log security-relevant events
  • Monitor for suspicious activity
  • Set up alerts for security incidents
  • Keep logs secure and retain appropriately

2. Incident Response

  • Have an incident response plan
  • Practice incident response procedures
  • Document security incidents
  • Learn from incidents to improve

Compliance and Auditing

1. Compliance

  • Understand applicable compliance requirements
  • Implement controls to meet requirements
  • Document compliance measures
  • Regular compliance reviews

2. Auditing

  • Audit access to sensitive resources
  • Review security logs regularly
  • Conduct security reviews of code changes
  • Perform periodic security assessments

Security Testing

1. Testing Strategy

  • Include security in testing strategy
  • Test authentication and authorization
  • Test input validation
  • Perform penetration testing when appropriate

2. Automated Security Testing

  • Use static analysis security testing (SAST)
  • Use dependency vulnerability scanning
  • Integrate security testing into CI/CD
  • Fix security issues before deployment

Security Documentation

1. Security Policies

  • Document security policies clearly
  • Keep policies simple and actionable
  • Update policies as threats evolve
  • Make policies accessible to the team

2. Security Procedures

  • Document security procedures
  • Keep runbooks for security incidents
  • Document secure coding practices
  • Maintain security architecture documentation

Security Culture

1. Team Awareness

  • Educate team on security best practices
  • Make security everyone's responsibility
  • Encourage security questions and discussions
  • Learn from security mistakes

2. Continuous Improvement

  • Review and update security practices regularly
  • Stay informed about security threats
  • Share security learnings with the team
  • Balance security with usability

When to Enhance Security

Security Enhancement Triggers

  • Real Threats: When you have actual security incidents or identified threats
  • Compliance Requirements: When you have regulatory or compliance needs
  • Scale: When you have more users/data that increases attack surface
  • Sensitive Data: When handling more sensitive data than before
  • Business Requirements: When business needs require enhanced security

Security Enhancement Approach

  1. Assess Real Risks: Focus on actual threats, not theoretical ones
  2. Prioritize by Impact: Address high-impact, high-likelihood threats first
  3. Implement Incrementally: Add security measures as needed
  4. Test Security: Verify security measures work as intended
  5. Document Decisions: Record why security measures were added

What NOT to Do

  • Don't add enterprise security patterns without enterprise threats
  • Don't over-complicate security for theoretical attacks
  • Don't ignore essential security (but don't over-engineer either)
  • Don't add security measures "just in case" without evidence
  • Don't sacrifice usability for theoretical security gains

Anti-Patterns to Avoid

  • Security through obscurity
  • Over-complicating security controls
  • Ignoring security until later
  • Using weak or custom encryption
  • Storing secrets in code or config files
  • Trusting client-side validation alone
  • Skipping security testing
  • Enterprise security patterns without enterprise threats
  • Adding security complexity "just in case"
  • Optimizing for theoretical attacks